The CAAC said "special" checks would start from July 20, but did not detail the checks.

The 19 airports would include the Beijing Capital International Airport, airports in Xinjiang Uighur Autonomous Region and Tibet Autonomous Region as well as airports of other 15 cities, including five Olympic co-host cities on the Chinese mainland - Shanghai, Qingdao, Tianjin, Shenyang and Qinhuangdao.

This was CAAC's latest move to better protect flight safety after the administration banned liquids, lighters and matches from carry- on luggage on board and required passengers in the country to remove their shoes for safety checks.

Originally published by Xinhua news agency, Beijing, in English 1033 7 Jul 08.